Laminate Flooring Calculator

1. Measure the room. Record the longest length and widest width in feet. Measure at the widest points because older rooms often have walls that are not perfectly square.
2. Find the coverage per box. Check the carton or product listing for the square footage each box covers. Different laminate products cover different amounts, even within the same brand.
3. Set the waste allowance. Start with 10% for straight layouts in rectangular rooms. Increase to 12% or 15% for diagonal patterns, hallways, closets, or rooms with many door cuts. Herringbone and chevron patterns can waste 15% to 20% because every plank gets an angled cut.
4. Add or subtract areas. If the room is not a simple rectangle, add a closet or alcove area. Subtract fixed cabinets or islands that you won't cover.
5. Enter price per square foot (optional). Add the material price if you want a cost estimate. This covers flooring material only, not labor, floor prep, transitions, trim, or disposal.
6. Read the results. The calculator shows boxes to buy, total square footage with waste, and leftover coverage after box rounding. If you entered plank width, it also shows a row count. A last row narrower than 2 inches is hard to lock in place, so the calculator warns you to adjust your starting row width.

Pro tip: Round up to full boxes and keep one unopened box on hand. Most retailers accept returns on unopened cartons, and you'll have matching planks from the same lot number if you need repairs later. Colors can shift between production runs.

Common mistake: Measuring only one wall and assuming the opposite wall is the same length. In older homes, walls can be off by 1 to 2 inches. Always measure both ends and use the larger number so you don't come up short at the far wall.

The laminate flooring calculator finds how much flooring to buy in three steps: measure the area, add waste, and round up to full boxes.

Area:

Net area = Room length (ft) × Room width (ft) + Additional area − Obstructions

Waste:

Adjusted area = Net area × (1 + Waste % / 100)

Boxes:

Boxes to buy = Adjusted area / Coverage per box, rounded up to a whole number

Cost (optional):

Material cost = Purchased coverage (boxes × coverage per box) × Price per sq ft

Variables:

• Room length = longest wall in feet
• Room width = shortest wall in feet
• Coverage per box = square feet each box covers (printed on the carton)
• Waste % = extra material for cuts, damaged planks, and layout losses
• Price per sq ft = material cost per square foot (optional)

Example:

A bedroom measures 12 ft × 15 ft. Each box covers 20 ft². You choose 10% waste.

• Net area = 12 × 15 = 180 ft²
• Waste = 180 × 0.10 = 18 ft²
• Adjusted area = 180 + 18 = 198 ft²
• Boxes = 198 / 20 = 9.9, rounded up = 10 boxes
• Purchased coverage = 10 × 20 = 200 ft²
• Leftover = 200 − 198 = 2 ft² (spare planks for repairs)

Assumptions and notes:

• The calculator rounds up to whole boxes because you can't buy a partial carton. This rounding adds a small amount of leftover material.
• Waste covers crosscuts at walls, lengthwise rips at the last row, damaged planks, and stagger offsets. Diagonal layouts waste more because every wall intersection creates an angled cut.
• Material cost does not include labor, floor prep, transitions, quarter-round trim, underlayment, disposal, or tools. It reflects material only.
• For concrete subfloors, check whether the product requires a separate underlayment or moisture barrier. Some laminate planks have attached padding, which changes the underlayment requirement.
• Plank direction affects waste. Running planks lengthwise down a hallway wastes less than running them crosswise, because fewer cuts are needed per row.